[Samba] Fwd: ntlm_auth and freeradius

[Alexander Harm || ApfelQ]

I can share my notes, we authenticate UniFi clients via Freeradius against Samba AD. We also check group membership which you might or might not need:

## 4 FreeRADIUS

### 4.1 Basics

```bash
apt install freeradius freeradius-ldap freeradius-utils

# create new DH-params
openssl dhparam -out /etc/freeradius/3.0/certs/dh 2048
```

### 4.2 Configure Authentication

- modify mschap to use winbind, uncomment the following lines

```
# /etc/freeradius/3.0/mods-available/mschap
require_encryption = yes
require_strong = yes
winbind_username = "%{mschap:User-Name}"
winbind_domain = "%{%{mschap:NT-Domain}:-NTDOMAINNAME}"
winbind_retry_with_normalised_username = yes
```

- add to global section in samba conf

```
# /etc/samba/smb.conf
ntlm auth = mschapv2-and-ntlmv2-only
```

- fix perms and restart

```bash
usermod -a -G winbindd_priv freerad
service freeradius restart
service samba-ad-dc restart
```

### 4.3 Configure LDAP (group information)

- enable ldap

```bash
cd /etc/freeradius/3.0/mods-enabled
ln -s ../mods-available/ldap ldap
chown -h freerad:freerad ldap
```

- modify module ldap to retrieve group information

```
# /etc/freeradius/3.0/mods-available/ldap
server = '10.0.1.250'
server = '10.0.1.251'
identity = 'cn=dc01,cn=users,dc=ds,dc=example,dc=com'
password = ***
base_dn = 'cn=users,dc=ds,dc=example,dc=com'
user: filter = "(|(samaccountname=%{%{Stripped-User-Name}:-%{User-Name}})(userprincipalname=%{User-Name}))"
group: filter = "(objectClasse=group)"
group: membership_filter = "(member:1.2.840.113556.1.4.1941:=%{control:Ldap-UserDn})"
start_tls = yes
ca_file = /etc/ssl/certs/ca-certificates.crt
```

### 4.4 Configure EAP

- add root.ca and services.ca to certificate store

```bash
cp /home/dcadmin/root.ca.crt /usr/local/share/ca-certificates/
cp /home/dcadmin/service.ca.crt /usr/local/share/ca-certificates/
update-ca-certificates
```

- add radius cert and key

```bash
cp /home/dcadmin/service.radius.key /etc/freeradius/3.0/certs/service.radius.key
cp /home/dcadmin/service.radius.crt /etc/freeradius/3.0/certs/service.radius.crt

chmod 640 /etc/freeradius/3.0/certs/service.radius.*
chown freerad:freerad /etc/freeradius/3.0/certs/service.radius.*
```

- configure eap module to use peap per default

```
# /etc/freeradius/3.0/mods-available/eap
default_eap_type = peap

#private_key_password = whatever
private_key_file = ${certdir}/service.radius.key
certificate_file = ${certdir}/service.radius.crt

tls_min_version = "1.2"

cache: enable = yes
cache: name = “<somename>.radius"
cache: persist_dir = "${logdir}/tlscache"

peap: copy_request_to_tunnel = yes
```

### 4.5 Configure Clients

- add client for UniFi

```
# /etc/freeradius/3.0/clients.conf
client unifi {
ipaddr = 10.0.1.0/24
secret = ***
}
```

### 4.6 Configure Authorization

- devices/user via EAP

```
# /etc/freeradius/3.0/sites-enabled/inner-tunnel
post-auth {
if (!(Ldap-Group == “SOMEGROUP")) {
reject
}
```

### 4.7 Finish

```bash
service freeradius restart
```

> On Thursday, Apr 06, 2023 at 9:46 AM, Matthias Kühne | Ellerhold Aktiengesellschaft via samba <samba at lists.samba.org (mailto:samba at lists.samba.org)> wrote:
> Hello Tim, Hello samba-people,
>
> is there an uptodate guide for authenticating via freeradius somewhere?
>
> I have some Ubiquiti APs plus a Cloud Key and I want to authenticate
> WLAN clients via WPA2-Enterprise instead of a (shared) PSK.
>
> It seems like
> https://wiki.samba.org/index.php/Authenticating_Freeradius_against_Active_Directory
> is missing some steps (basic setup of freeradius).
>
> Can you write up some of your findings please?
>
> Thanks and happy holidays,
> Matthias.
>
> Am 04.04.23 um 10:38 schrieb Tim ODriscoll via samba:
> > Dear All,
> >
> > Well, this is very embarrassing....
> >
> > It seems that running 'smbcontrol all reload-config' isn't sufficient for reloading the ntlm config parameters.
> >
> > I tried restarting the whole samba service on the DC my FR box was authenticating against (systemctl restart sernet-samba-ad) and my test laptop is now connected to the network on the correct VLAN.
> >
> > I apologise for wasting everyone's time - now I'll get back to cleaning up all the config files and making sure BYOD still works etc.
> >
> > Thank you,
> >
> > Tim
>
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